Setting Language Codes in HTML Files
Note
Indexing Service is no longer supported as of Windows XP and is unavailable for use as of Windows 8. Instead, use Windows Search for client side search and Microsoft Search Server Express for server side search.
If you had a website containing documents in different languages, you could set the MS.Locale property in each document for queries on documents in a certain language, and set the Content-Type variable so that the proper character set is displayed in the results. You should set both of these variables if your HTML pages are written in different languages.